Version bump to `2.4.0` (Make ‘text’ property writeable)

Version bump to `2.3.0` (add keyboardAppearance, fix fieldLabel font,…

… textfield return delegate method)

* Add `keyboardAppearance` property, to customize internal textfield's keyboardAppearance. See: rsattar#22

* `UIAppearance` support for field label. See: rsattar#10

* Add optional delegate method to handle what to do when the internal textfield returns. See: rsattar#15

* Fix 'dead store' warnings during Analysis. See: rsattar#21

Version bump to `2.2.0` (fix trailing comma, tokenization characters,…

… unselect on resign)

* Hide the comma of the last token view, when the token input is no longer selected.
* Support for (optional) additional characters which will trigger tokenization.
* Fix bug where if first responder is resigned, the token view was not unselecting.

Update to 2.1.0

Updated semver to 2.0.0

Given the nullability and generics, this makes a potentially backwards _incompatible_ change if the library is being used in Swift. So better to be safe and bump the major version than accidentally break some projects.

Update podspec to 1.2.0

Disable auto-correct when a token is selected

Improved Readme.md with GIF screencap